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(   ) 15.       I walked into class,the teacher had started teaching already. 

A. By the time   B. While   C. After   D. Because

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Tom is a boy of fifteen. His parents 41.        (die) two years ago,and he had to make a living by himself. Now he 42.       (work) as a servant at Mr. Jackson's. He works hard and Mr. Jackson is pleased with him. 

Mr. Jackson enjoys 43.       (plant) all kinds of trees. There are many kinds of precious(珍贵的) trees in his garden. The week before last Mr. Jackson 44.       (bring) a few trees home,planted them in the garden himself and watered them every day. Some days later, he had to 45.       (leave) for another city. Before he started, he said to Tom,"46.       (take) good care of the plants when I'm out. Some boys of our neighbors always want 47.      (steal) them."

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Six days passed and Mr. Jackson came back. As soon as he saw Tom,he asked, "50.       anyone ever      (come) to steal the trees?"

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